WASHINGTON (AP) — Dave Grohl is back on stage and doing it in style. The Foo Fighters performed their 20th anniversary concert in Washington on Saturday, their first show since Grohl broke his leg during a concert in Sweden last month. Grohl performed sitting down in a throne with the Foo Fighters logo on the back and his guitars sticking out of the sides. Other performers included Joan Jett and the Blackhearts, Heart, Gary Clark Junior, LL Cool J and Buddy Guy.